package com.dgut.test2.service;

import org.springframework.boot.CommandLineRunner;
import org.springframework.core.env.Environment;

import java.util.Objects;

@SuppressWarnings("unused")
class CustomCommandLineRunner implements CommandLineRunner {

    Environment env;

    //使用构造方法，注入Environment
    public CustomCommandLineRunner(Environment env){
        this.env = env;
    }

    @Override
    public void run(String... args){
        System.out.println("利用Spring Boot自动装配的CommandLineRunner。");

        //利用random的RandomValuePropertySource产生一个32位随机字串。
        System.out.println("生成一个随机字符串：".concat(Objects.requireNonNull(env.getProperty("random."))));
    }

}
